A ball is kicked up from a platform. The height of the ball above the ground (measured in meters) can be modeled by the function, h(t) = 4.5 + 18t - 4.8t?
where t represents the amount of time (in seconds) since the ball was kicked. When does the ball reach the ground?
O 1.875 seconds
O 2 seconds
O 3.985 seconds
O 21.375 seconds